FilePermission FilePermission(String, String) in Java

FilePermission(String, String): This method is available in the java.io.FilePermission class of Java.

Syntax:

java.io.FilePermission.FilePermission(String path, String actions)

This method takes two arguments. This method creates a new FilePermission object with the specified actions.

The path is the pathname of a file or directory, and actions contain a comma-separated list of the desired actions granted on the file or directory.

Note:

1. Possible actions are"read", "write", "execute", "delete", and "readlink".

2. A pathname containing an empty string represents an empty path.

Parameters: Two parameters are required for this method.

path: the pathname of the file/directory.

actions: the action string.

Throws:

IllegalArgumentException - if actions are null, empty, malformed, or contain an action other than the specified possible actions.

Approach 1: When no exception

Java

import java.io.FilePermission;

public class FilePermissionFilePermission {
    public static void main(String[] args) {

        String path = "D:\\hello.txt";
        String actions = "read";
        FilePermission filePermission =
                    new FilePermission(path, actions);

        System.out.println(filePermission);
    }
}

Output:

("java.io.FilePermission" "D:\hello.txt" "read")

Approach 2: IllegalArgumentException 

Java

import java.io.FilePermission;

public class FilePermissionFilePermission {
    public static void main(String[] args) {

        String path = "D:\\hello.txt";
        String actions = null;
        FilePermission filePermission = 
                  new FilePermission(path, actions);

        System.out.println(filePermission);
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: invalid actions mask
	at java.base/java.io.FilePermission.init(FilePermission.java:316)
	at java.base/java.io.FilePermission.<init>(FilePermission.java:489)
	

Some other methods of FilePermission

equals(Object): This method checks two FilePermission objects for equality. Checks that obj is a FilePermission, and has the same pathname and actions as this object.

FilePermission(String, String): This method creates a new FilePermission object with the specified actions.

getActions(): This method returns the "canonical string representation" of the actions.

hashCode(): This method returns the hash code value for this object.

implies(Permission): This method checks if this FilePermission object "implies" the specified permission.

newPermissionCollection(): This method returns a new PermissionCollection object for storing FilePermission objects.